tl;dr: An story about someone turning their life into a train wreck, that is enjoyable to watch unfold due to the set of screwed up and unlikable characters.

It is difficult to explain why I like this manga and I totally understand why it has such a low score. The protagonist is a horrible person, and the main heroines while I did like a reasonable amount I do admit aren't good people either. Really, no one in the manga is a good person, so they're not characters you can like or empathize with, but they're not characters you can enjoy hating either. There is character and relationship development, but as there isn't a particular fondness for these characters that doesn't have a lot of impact. The plot is ridiculous in that there's always something crazy happening, which doesn't really fit a manga like this, and to some degree there are things that feel inconsistent, but more so than that are completely random, especially the ending. There is a really high melodrama and angst. Now despite all this, I still feel the author completely achieved the objective of what they were trying to do, in that the reason I like this manga can be best explained by the opening, sometimes it's just really enjoyable to watch things burn. The protagonist may be an awful person, but watching him of his own violation send what seems like something happy and perfect hurtling towards destruction, watching everything falling apart and all the craziness that ensues, and ultimately seeing a glimpse of how things were in the aftermath was quite engrossing and engaging, and ultimately a very worthwhile read in my opinion. The art was also really good most of the time, especially the color pages, though there are some spots where it noticeably got terrible.